I am trying to get the highest and lowest value of a certain number of bars starting from the bar which is already closed. Can anybody help?

<p id="isPasted">We are all watching the same market, but one trader uses a 5 minute bar, one uses a 1 minute bar, another a 30 minute bar, another a 10K vol bar, another a 5K tick bar, another an 8 range bar, and so on. These are just data presentation mechanisms, and the market does not have a concept of any of them; they are purely our creation. The close of a bar is a snapshot of a price traded in the flow of market activity.</p><p>&nbsp;What are your thoughts? If you use the closing of a bar as a part of your trading, or if you feel that a bar's closing price is important, can you explain and convince me (or others)?</p>

<p id="isPasted">In MQL4 and MQL5 (MetaTrader platforms), you can find the highest and lowest values of a specific range of bars by using functions that return the index of the extreme value, then retrieving the actual price from that index.&nbsp;</p><p>To start from the first "already closed" bar, you should use an offset of 1, as index 0 always represents the current live candle.&nbsp;</p><p><strong>For MQL4</strong></p><p>Use iHighest() and iLowest() to find the index, then High[] or Low[] to get the value.</p><p><strong>Logic:</strong></p><p>int highestIndex = iHighest(NULL, 0, MODE_HIGH, N, 1); (N = number of bars to check)</p><p>double highestValue = High[highestIndex];</p><p><strong>Parameters explained:</strong></p><p>NULL, 0: Current symbol and timeframe.</p><p>MODE_HIGH / MODE_LOW: Searching for high or low prices.</p><p>count (N): How many bars to look back.</p><p>start (1): Starting index (1 is the first closed bar).&nbsp;</p><p><strong>For MQL5</strong></p><p>While MQL5 supports iHighest and iLowest, it is often handled using CopyHigh() and CopyLow() into arrays for more robust data checking.&nbsp;</p><p><strong>Logic:</strong></p><p>double highArray[];</p><p>CopyHigh(_Symbol, _Period, 1, N, highArray); (Starts at index 1 for N bars).</p><p>double highestValue = highArray[ArrayMaximum(highArray)];.&nbsp;</p><p>Example (MQL4/MQL5 compatible)</p><p><strong>To get the highest price of the last 10 closed bars:</strong></p><p>cpp</p><p><strong>// 1</strong>. Get the index of the highest bar in the last 10 closed bars</p><p>int hIndex = iHighest(_Symbol, _Period, MODE_HIGH, 10, 1);</p><p><br></p><p><strong>// 2</strong>. Get the actual price value using that index</p><p>double maxPrice = iHigh(_Symbol, _Period, hIndex);</p><p>Print("Highest value of last 10 closed bars: ", maxPrice);</p><p id="isPasted"><strong>Key Reminders:</strong></p><ul><li>Index 0: The candle currently forming (avoid this if you only want closed data).</li><li>Index 1: The most recently completed candle.</li><li>Errors: Always check if the returned index is valid (not -1) before using it to fetch a price. </li></ul>